♥️❤️❤️♥️♥️♥️❤️objective type of questions class 8 chapter friction
Answers
Answer:
1. Friction is:
a) pressure
b) force
c) substance
d) None of these
Ans:- b)
2. The special shape of the body due to which it experiences least fluid friction is called:
a) streamlined
b) oblong
c) cuboidal
d) spherical
Ans:- a)
3. Round structures with rollers used in various machines, fans and bicycles in order to reduce friction are called:
a) lubricants
b) greases
c) ball bearings
d) None of these
Ans:- c)
4. The maximum value of force required to make the body to slide is known as:
a) static friction
b) sliding friction
c) rolling friction
d) drag
Ans:- b)
5. The frictional force exerted by fluids is called:
a) pressure
b) drag
c) buoyancy
d) None of these
Ans:- b)
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Step-by-step explanation:
Complete the sentence. Friction always ____________
a. helps the motion
b. opposes the motion
c. both of these
d. none of these
2. Which one of these characteristics does a smooth surface has?
a. Less frictional force
b. More frictional force
c. Sometimes less and sometimes more force
d. All of above
3. Friction is a __________
a. Contact force
b. Non-contact force
c. Magnetic force
d. None of these
4. What kind of substances are known as lubricants
a. Increase friction
b. Decrease friction
c. Increase or decrease friction
d. None of these
5. Fluid are____
a. Gases
b. Liquids
c. Gases and liquids both
d. None of these
6. On what force of friction depends?
a. Smoothness of surface
b. Roughness of surface
c. Inclination of surface
d. Al of above
7. Friction is a /an_______
a. Evil
b. Foe
c. Both (a) and (b)
d. None
8. Lubricants ________
a. Increase friction
b. Reduce friction
c. Both (a) and (b)
d. None
9. Rolling friction is smaller than?
a. Sliding friction
b. Static friction
c. Fluid friction
d. All of the above
10. The shape of the airplane is like a
a. Bird
b. Car
c. Dog
d. All
Answers
1. B
2. A
3. A
4. B
5. C
6. D
7. C
8. B
9. D
10. A